PURPOSE: To obtain a device in which a CMOS output or an open drain output is selected.

CONSTITUTION: A series circuit composed of a P-channel MOSFET 6, a switching circuit 7 and an N-channel MOSFET 5 is interposed between a high potential power supply 1 and a low potential power supply 2, and an output terminal 3 is connected to a connection between the switching circuit 7 and the N-channel MOSFET 5. If the switching circuit 7 is set to the closing state when turning on the P-channel MOSFET 6 or the N-channel MOSFET 5, the output terminal goes to an H level or an L level and a CMOS output is obtained at the output terminal 3. If the switching circuit 7 is closed when turning on the N-channel MOSFET 5, the output terminal 3 goes to an L level and when the switching circuit 7 is opened, the N-channel MOSFET 5 is in the floating state and an open drain output is obtained at the output terminal 3.